Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> In preparation for the next patch, we want the engine to appear idle
> after a reset (if there are no requests in flight). For execlists, this
> entails clearing the active status on reset, it will be regenerated on
> restarting the engine after the reset. In the process, note that a
> couple of other status flags and checks could be moved into the
> describing function.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_lrc.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index deeedfc9fe44..0af9488e4070 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1462,6 +1462,9 @@ static void enable_execlists(struct intel_engine_cs *engine)
> I915_WRITE(RING_HWS_PGA(engine->mmio_base),
> engine->status_page.ggtt_offset);
> POSTING_READ(RING_HWS_PGA(engine->mmio_base));
> +
> + /* Following the reset, we need to reload the CSB read/write pointers */
> + engine->execlists.csb_head = -1;
> }
>
> static int gen8_init_common_ring(struct intel_engine_cs *engine)
> @@ -1479,11 +1482,6 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine)
> enable_execlists(engine);
> DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name);
>
> - GEM_BUG_ON(engine->id >= ARRAY_SIZE(gtiir));
> -
> - execlists->csb_head = -1;
> - execlists->active = 0;
> -
> /* After a GPU reset, we may have requests to replay */
> if (execlists->first)
> tasklet_schedule(&execlists->tasklet);
> @@ -1529,6 +1527,8 @@ static void reset_irq(struct intel_engine_cs *engine)
> struct drm_i915_private *dev_priv = engine->i915;
> int i;
>
> + GEM_BUG_ON(engine->id >= ARRAY_SIZE(gtiir));
> +
> /*
> * Clear any pending interrupt state.
> *
> @@ -1577,6 +1577,9 @@ static void reset_common_ring(struct intel_engine_cs *engine,
>
> spin_unlock_irqrestore(&engine->timeline->lock, flags);
>
> + /* Mark all CS interrupts as complete */
> + execlists->active = 0;
> +
> /* If the request was innocent, we leave the request in the ELSP
> * and will try to replay it on restarting. The context image may
> * have been corrupted by the reset, in which case we may have
> --
> 2.15.1
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